24V IN , 5V and 12V OUT , ZVS Isolated Converter Module Family 24 Volt PI31xx-01-HVIZ 24 Volt Rev 1.6 Page 1 of 18 09/2018 Product Description The ZVS Isolated Converter Module Series consists of high‑density isolated DC‑DC converters implementing Zero‑Voltage Switching topology. The 24V IN series operates over an input range of 18 – 36V delivering 50W of output power, yielding an unprecedented power density of 334W/in 3 . These converter modules are surface mountable and only ~0.5in square in area achieving ~50% space reduction versus conventional solutions. A switching frequency of 900kHz allows for small input and output filter components which further reduces the total size and cost of the overall system solution. The output voltage is sensed and fed back to the internal controller using a proprietary isolated magnetic feedback scheme which allows for high bandwidth and good common‑mode noise immunity. The PI31xx‑01‑HVIZ series requires no external feedback compensation and offers a total solution with a minimum number of external components. A rich feature set is offered, including output voltage trim capability, output overvoltage protection, adjustable soft start, overcurrent protection with auto‑restart, over and under input voltage lockout and a temperature monitoring and protection function that provides an analog voltage proportional to the die temperature as shut down and alarm capabilities. Features & Benefits • Efficiency up to 88% • High switching frequency minimizes input filter requirements and reduces output capacitance • Proprietary “Double-Clamped” ZVS Buck-Boost Topology • Proprietary isolated magnetic feedback • Small footprint (0.57in 2 ) enables PCB area savings • Very low profile (0.265in) • On/Off Control, positive logic • Wide trim range +10/–20% • Temperature Monitor (TM) & Overtemperature Protection (OTP) • Input UVLO & OVLO and output OVP • Overcurrent protection with auto restart • Adjustable soft start • 2250V DC input-to-output isolation Applications • Industrial and Networking Applications • Space-Constrained Systems • Isolated Board-Level Power Package Information • Surface Mountable 0.87 x 0.65 x 0.265in package • Weight = 7.8 grams Device Output Voltage I OUT Max Set Range PI3109-01-HVIZ 5V 4 – 5.5V 10A PI3106-01-HVIZ 12V 9.6 – 13.2V 4.2A
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24VIN, 5V and 12VOUT, ZVS Isolated Converter Module Family
24 VoltPI31xx-01-HVIZ
24 Volt Rev 1.6Page 1 of 18 09/2018
Product Description
The ZVS Isolated Converter Module Series consists of high‑density isolated DC‑DC converters implementing Zero‑Voltage Switching topology.
The 24VIN series operates over an input range of 18 – 36V delivering 50W of output power, yielding an unprecedented power density of 334W/in3.
These converter modules are surface mountable and only ~0.5in square in area achieving ~50% space reduction versus conventional solutions.
A switching frequency of 900kHz allows for small input and output filter components which further reduces the total size and cost of the overall system solution. The output voltage is sensed and fed back to the internal controller using a proprietary isolated magnetic feedback scheme which allows for high bandwidth and good common‑mode noise immunity.
The PI31xx‑01‑HVIZ series requires no external feedback compensation and offers a total solution with a minimum number of external components. A rich feature set is offered, including output voltage trim capability, output overvoltage protection, adjustable soft start, overcurrent protection with auto‑restart, over and under input voltage lockout and a temperature monitoring and protection function that provides an analog voltage proportional to the die temperature as shut down and alarm capabilities.
Features & Benefits
• Efficiency up to 88%
• High switching frequency minimizes input filter requirements and reduces output capacitance
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control. Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
Start Up Current Limit [b] IESL ENABLE = 1V –120 –90 –60 µA
Module Enable Voltage VEME 1.95 2.5 3.05 VDC
Module Disable Voltage VEMD 1.8 2.35 2.9 VDC
Disable Hysteresis VEDH 150 mV
Enable Delay Time tEE 10 µs
Disable Delay Time tED 10 µs
Maximum Capacitance CEC 1500 pF
Maximum External Toggle Rate fEXT 1 Hz
TRIM/SS
Trim Voltage Reference VREF 1.232 VDC
Internal Capacitance CREFI 10 nF
External Capacitance CREF 0.39 µF
Internal Resistance RREFI 10 kΩ
TM (Temperature Monitor)
Temperature Coefficient [a] TMTC 10 mV/ºK
Temperature Full Range Accuracy [a] TMACC –5 5 ºK
Drive Capability ITM –100 µA
TM Output Setting VTM Ambient Temperature = 300ºK 3.00 V
Thermal Specification
Junction Temperature Shutdown [a] TMAX 130 135 140 ºC
Junction‑to‑Case Thermal Impedance θJ‑C 3 ºC/W
Case‑to‑Ambient Thermal Impedance θC‑A Mounted on 9in2 1oz. Cu 6 layer PCB 25°C 9.6 ºC/W
Soldering
Peak Temperature During ReflowMSL 5; time on floor = 48 hours 225 ºC
MSL 6; time on floor = 4 hours 245 ºC
Regulatory Specification
IEC 60950‑1:2005 (2nd Edition)
EN 60950‑1:2006
IEC 61000‑4‑2
UL60950‑1:2007
CAN/CSA C22.2 NO. 60950‑1‑07
Recommended Input Fuse Rating IFUSE Fast acting LITTLEFUSE Nano2 Series Fuse 4 10 A
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control. Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control. Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
24 Volt Rev 1.6Page 12 of 18 09/2018
PI31xx-01-HVIZ
PI3106-01-HVIZ Electrical Characteristics (Cont.)
Parameter Symbol Conditions Min Typ Max Unit
ENABLE
DC Voltage Reference Output VERO 4.65 4.9 5.15 VDC
Start Up Current Limit [b] IESL ENABLE = 1V –120 –90 –60 µA
Module Enable Voltage VEME 1.95 2.5 3.05 VDC
Module Disable Voltage VEMD 1.8 2.35 2.9 VDC
Disable Hysteresis VEDH 150 mV
Enable Delay Time tEE 10 µs
Disable Delay Time tED 10 µs
Maximum Capacitance CEC 1500 pF
Maximum External Toggle Rate fEXT 1 Hz
TRIM/SS
Trim Voltage Reference VREF 1.233 VDC
Internal Capacitance CREFI 10 nF
External Capacitance CREF 0.39 µF
Internal Resistance RREFI 10 kΩ
TM (Temperature Monitor)
Temperature Coefficient [a] TMTC 10 mV/ºK
Temperature Full Range Accuracy [a] TMACC –5 5 ºK
Drive Capability ITM –100 µA
TM Output Setting VTM Ambient Temperature = 300ºK 3.00 V
Thermal Specification
Junction Temperature Shutdown [a] TMAX 130 135 140 ºC
Junction‑to‑Case Thermal Impedance θJ‑C 3 ºC/W
Case‑to‑Ambient Thermal Impedance θC‑A Mounted on 9in2 1oz. Cu 6 layer PCB 25°C 9.2 ºC/W
Soldering
Peak Temperature During ReflowMSL 5; time on floor = 48 hours 225 ºC
MSL 6; time on floor = 4 hours 245 ºC
Regulatory Specification
IEC 60950‑1:2005 (2nd Edition)
EN 60950‑1:2006
IEC 61000‑4‑2
UL60950‑1:2007
CAN/CSA C22.2 NO. 60950‑1‑07
Recommended Input Fuse Rating IFUSE Fast acting LITTLEFUSE Nano2 Series Fuse 4 10 A
[a] These parameters are not production tested but are guaranteed by design, characterization and correlation with statistical process control. Unless otherwise specified, ATE tests are completed at room temperature.
[b] Current flow sourced by a pin has a negative sign.
The input power pins on the PI31xx‑01‑HVIZ are connected to the input power source which can range from 18V to 36VDC.Under surge conditions, the PI31xx‑01‑HVIZ can withstand up to 45VDC for 100ms without incurring damage. The user should take care to avoid driving the input rails above the specified ratings. Since the PI31xx‑01‑HVIZ is designed with high reliability in mind, the input pins are continuously monitored. If the applied voltage exceeds the input overvoltage trip point, the conversion process shall be terminated immediately. The converter initiates soft start automatically within 80ms after the input voltage is reduced back to the appropriate value. The input pins do not have reverse‑polarity protection. If the PI31xx‑01‑HVIZ is operated in an environment where reverse polarity is a concern, the user should consider using a polarity protection device such as a suitably rated diode. To avoid the high losses of using a diode, the user should consider the much higher efficiency family of intelligent Cool‑ORing® solutions that can be used in reverse‑polarity applications. Information is available at vicorpower.com.
The PI31xx‑01‑HVIZ will draw nearly zero current until the input voltage reaches the internal start up threshold. If the ENABLE pin is not pulled low by external circuitry, the output voltage will begin rising to its final output value about 80ms after the input UV lockout releases. This will occur automatically even if the ENABLE pin is floating.
To help keep the source impedance low, the input to the PI31xx‑01‑HVIZ should be bypassed with (2) 4.7µF 50V ceramic capacitors of X7R dielectric in parallel with a low Q 100µF 63V electrolytic capacitor. To reduce EMI and reflected ripple current, a series inductor of 0.2 – 0.47µH can be added. The input traces to the module should be low impedance configured in such a manner as to keep stray inductance minimized.
ENABLE
The ENABLE pin serves as a multi‑function pin for the PI31xx‑01‑HVIZ. During normal operation, it outputs the on‑board 4.9V regulator which can be used for trimming the module up. The ENABLE pin can also be used as a remote enable pin either from the secondary via an optocoupler and some external isolated bias supply or from the primary side through a small‑signal transistor, FET or any device that sinks 3.3mA, minimum. If the ENABLE pin is lower than 2.35V typical, the converter will be held off or shut down if already operating. A third feature is offered in that during a fault condition such as output OVP, input UV or OV, or output current limit, the ENABLE pin is pulled low internally. This can be used as a signal to the user that a fault has occurred.
Whenever the ENABLE pin is pulled low, the TRIM/SS pin follows, resetting the internal and external soft‑start circuitry. All faults will pull ENABLE low including overtemperature. If increased turn‑on delay is desired, the ENABLE pin can be bypassed with a small capacitor up to a maximum of 1500pF.
TRIM/SS Pin
The TRIM/SS pin serves as another multi‑purpose pin. First, it is used as the reference for the internal error amplifier. Connecting a resistor from TRIM/SS to SGND allows the reference to be margined down by as much as –20%. Connecting a resistor from TRIM/SS to ENABLE will allow the reference and output voltage to be margined up by 10%. If the user wishes a longer start up time, a small ceramic capacitor can be added to TRIM/SS to increase it. It is critical to connect any device between TRIM/SS and SGND and not –IN, otherwise high frequency noise will be introduced to the reference and possibly cause erratic operation. Referring to the figures below, the appropriate trim‑up or trim‑down resistor can be calculated using the equivalent circuit diagram and the equations. When trimming up the trim‑down resistor is not populated and when trimming down, the trim‑up resistor is not populated. The soft‑start time is adjustable and has a default value of 500µs to reach steady state. The internal soft‑start capacitor value is 10nF.
PI31xx
RREFI
RLOW
RHIGH
TRIM/SSVREFVERO
SGND
ENABLE
10kΩ
U.S. PATS. LISTED ON PACKING MATERIALS & DATASHEETS
MADE IN
USA
DC-DCConverter
Figure 21 — PI31xx-01-HVIZ shown with system fuse, filter, decoupling and extended soft start
The TM pin serves as an output indicator of the internal package temperature which is within ±5°K of the hottest junction temperature. Because of this, it is a good indicator of a thermal overload condition. The output is a scaled, buffered analog voltage which indicates the internal temperature in degrees Kelvin. Upon a thermal overload, the TM pin is pulled low, indicating a thermal fault has occurred. Upon restart of the converter, the TM pin reverts back to a buffered monitor. The thermal shutdown function of the PI31xx‑01‑HVIZ is a fault feature which interrupts power processing if a certain maximum temperature is exceeded. TM can be monitored by an external microcontroller or circuit configured as an adaptive fan speed controller so that air flow in the system can be conveniently regulated.
SGND
The PI31xx‑01‑HVIZ SGND pin is the “quiet” control circuitry return. It is basically an extension of the internal signal ground. To avoid contamination and potential ground loops, this ground should NOT be connected to –IN since it is already star connected inside the package. Connect signal logic to SGND.
Output Power Pins +OUT and –OUT
The output power terminals OUT(+) and OUT(–) deliver the maximum output current from the PI31xx‑01‑HVIZ through the J‑lead output pins. This configuration allows for a low impedance output and should be connected to multi‑layer PCB parallel planes for best performance. Due to the high switching frequency, output ripple and noise can be easily attenuated by adding just a few high‑quality X7R ceramic capacitors while retaining adequate transient response for most applications. The PI31xx‑01‑HVIZ does not require any feedback loop compensation nor does it require any opto‑isolation. All isolation is contained within the package. This greatly simplifies the use of the converter and eliminates all outside influences of noise on the quality of the output voltage regulation and feedback loop. It is important for the user to minimize resistive connections from the load to the converter output and to keep stray inductance to a minimum for best regulation and transient response. The very small size footprint and height of the PI31xx‑01‑HVIZ allows the converter to be placed in the optimum location to allow for tight connections to the point‑of‑load.
24 Volt Rev 1.6Page 17 of 18 09/2018
PI31xx-01-HVIZ
Package Outline & Recommended PCB Land Pattern
Figure 23 — Package outline & recommended PCB land pattern
24 Volt Rev 1.6Page 18 of 18 09/2018
PI31xx-01-HVIZ
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Vicor Corporation25 Frontage Road
Andover, MA, USA 01810Tel: 800‑735‑6200Fax: 978‑475‑6715
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